kingdom Plantae - plants »  divisio Magnoliophyta - flowering plants »  class Rosopsida - eudicots » order Malpighiales »  family Violaceae »  tribus Violeae > genus Viola > section Viola sect. Nosphinium  W. Becker 

Viola subsect. Boreali-Americanae (W. Becker) Gil-ad       

Viola affinis Leconte - Sand Violet

Viola brittoniana Pollard - Northern Coastal Violet

Viola calcicola R.A. McCauley & H.E. Ballard

Viola clauseniana Baker - Clausen's Violet

Viola cucullata Ait. - Marsh Blue Violet

Viola egglestonii Brainerd - Glade Violet

Viola hirsutula Brainerd - Southern Woodland Violet

Viola missouriensis Greene - Missouri Violet

Viola nephrophylla Greene - Northern Bog Violet

Viola novae-angliae House - New England Blue Violet

Viola nuevo-leonensis W. Becker

Viola pedatifida G. Don - Prairie Violet

Viola sagittata Ait. - Arrowleaf Violet

Viola septemloba Le Conte - Southern Coastal Violet

Viola sororia Willd. - Northern Woodland Violet

Viola subsinuata (Greene) Greene

Viola triloba Schwein.

Viola villosa Walt. 

Hybrids

Viola × bernardii Greene

Viola × bissellii House

Viola × champlainensis House

Viola × conjugens Greene

Viola × consobrina House

Viola × consocia House

Viola × cordifolia (Nutt.) Schwe

Viola × davisii House

Viola × dissita House

Viola × eamesii House

Viola × esculenta Elliott

Viola × filicetorum Greene

Viola × greenmanii House

Viola × hollickii House

Viola × insessa House

Viola × insolita House

Viola × lovelliana Brainerd

Viola × melissifolia Greene

Viola × mistura House

Viola × mulfordiae Pollard

Viola × napae House

Viola × notabilis E.P. Bicknell

Viola × palmata L. - Three-lobe

Viola × populifolia Greene

Viola × porteriana Pollard

Viola × ravida House

Viola × redacta House

Viola × robinsoniana House

Viola × ryoniae House

Viola × slavinii House

Viola × subaffinis House

Viola × viarum Pollard